3/10/2023 0 Comments Armadillo skullOnly rudiments of the postorbital process are present. 1c, d) form together an arrowhead at the midline of the skull roof. Their inner surfaces are slightly concave, passed over by a strong crest which contact with the nasoturbinal. 1a, b) are long and parallelogram-shaped, with rostral and caudal borders slanting and smooth. villosus are morphologically similar between sexes and follow the generalized pattern for most of described dasypodids (Grassé, 1955 Smith & Redford, 1990 Wible & Gaudin). Our results showed that the bony components of the adult skull of C. The existence of a mesethmoid in the species under study (see Ferigolo, 1981) was evaluated by examining the skulls of three litters: a 8-day-old male (M8), skull length (SL) 33 mm a 9-day-old female (F9), 35 mm SL a 60-day-old female (F60), 58 mm SL. Mean values for the measured parameters were compared between sexes by using a two-tailed t-test (Sokal & Rohlf, 1981). The narial bones and the ethmoid-sphenoid complex were not measured owing to they suffered some damage during the separation instance. The skulls were cleaned by conventional methods and exposed to consecutive treatments aimed to weaken the cranial sutures, those allowing us to isolate the bones: 1- boiling in NaOH 0.1 N (15 min) 2- immersion in ClH 0.1 N (5 min) 3- washed in current water.įor each bone, length (L) and width (W) or height (H), were measured by means of a digital calliper to the nearest 0.01 mm. Nineteen adults (10 females, 9 males) of Chaetophractus villosus were used they were live-trapped in a ratio of approximately 80 Km from the surroundings of Bahía Blanca city, Province of Buenos Aires, Argentina. villosus b) to elucidate if there are differences in the isolated bony components between adults of both sexes, taking into account the existence of a previous demonstrated sexual dimorphism in the whole skull of the species (Squarcia et al., 1999). The objectives of the present work are a) to perform morphological and morphometrical descriptions of the cranial bones of C. However, references about bone-by-bone description are very scarce (Wible & Gaudin, 2004), and no antecedents are available for C. Some significant contributions on the cranial morphology of this group are available from Parker (1885), Patterson et al. ![]() ![]() Notwithstanding the essential of morphological evidence to phylogenetic studies, the knowledge about the skull of the extant dasypodids is incomplete. The dasypodids constitute a significant xenarthran group owing to the place they have occupied in the mammalian phylogeny (Gaudin et al., 1996 Delsuc et al., 2003). It is distributed from the Chaco of Paraguay and Argentina in Argentina to Tierra del Fuego (Deferrari et al., 2002) in Chile along the south-eastern edge (Atalah, 1975 Wetzel, 1985). PALABRAS CLAVE: Dasypodidae Morfología Osteología Cráneo Dimorfismo sexual.Ĭhaetophractus villosus is a dasypodid commonly known as "larger hairy armadillo". El análisis morfométrico, sin embargo, demostró que la mayoría de los huesos ubicados en el plano rostrocaudal son más largos en las hembras, determinando mayores valores de longitudes total, basal y cóndilobasal del cráneo, que son las principales variables que contribuyen a determinar el dimorfismo sexual en esta especie. Los huesos son morfológicamente semejantes en ambos sexos y siguen el patrón generalizado de la mayoría de los dasipódidos descritos. RESUMEN: Realizamos estudios morfológico y morfométrico de los componentes óseos del cráneo de Chaetophractus villosus. KEY WORDS: Dasypodidae Morphology Osteology Skull Sexual dimorphism. ![]() The morphometric analysis, however, demonstrated that the bones lying in the rostrocaudal plane are mostly longest in females, determining higher values of the total, basal and condilobasal lengths of the skull, which are the main variables that contribute to a sexual dimorphism in this species. The skull components are morphologically similar between adults of both sexes, and follow the generalized pattern for most of described dasypodids. SUMMARY: The morphology and morphometry of the cranial bones of Chaetophractus villosus were studied. ![]() ** Cátedra de Fisiología Animal, Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Bahía Blanca, Argentina y Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. * Cátedra de Anatomía Comparada, Universidad Nacional del Sur, Bahía Blanca, Argentina. *Squarcia, Silvia Margarita *Sidorkewicj, Nora Silvia & **Casanave, Emma Beatriz Osteología Craneana del Armadillo Chaetophractus villosus (Mammalia, Xenarthra, Dasypodidae) Cranial Osteology of the Armadillo Chaetophractus villosus (Mammalia, Xenarthra, Dasypodidae)
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